/* Base styles - Mobile-first approach */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;

  /* Hide scrollbars but keep functionality */
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* Internet Explorer and Edge */
}

*::-webkit-scrollbar {
  width: 0px; /* Chrome, Safari, Opera */
  background: transparent;
}

html {
  font-size: 16px;
  height: 100%;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  height: 100vh;
  height: 100dvh; /* Dynamic viewport height for mobile */
  overflow: hidden;
  position: fixed;
  width: 100%;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

/* Allow text selection in forms */
input, textarea {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

/* App Container */
.app-container {
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
.app-header {
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: var(--spacing-sm) var(--spacing-md);
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 1000;
  min-height: 60px;
  flex-shrink: 0;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 100%;
}

.logo {
  height: 40px;
  max-width: 180px;
  object-fit: contain;
}

.app-title {
  font-size: 1.25rem;
  font-weight: 500;
  flex: 1;
  text-align: center;
  margin: 0 var(--spacing-md);
}

.version-badge {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-text-light);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  letter-spacing: 0.5px;
  transition: var(--transition-fast);
}

.version-badge:hover {
  background: rgba(255, 255, 255, 0.3);
}

.version-loading {
  opacity: 0.6;
}

.menu-button {
  background: none;
  border: none;
  color: var(--color-text-light);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--spacing-xs);
  display: flex;
  flex-direction: column;
  width: 24px;
  height: 24px;
  justify-content: space-between;
}

.menu-button span {
  background: var(--color-text-light);
  height: 2px;
  width: 100%;
  border-radius: 1px;
  transition: var(--transition-fast);
}

/* Back button in header */
.back-button {
  background: none;
  border: none;
  color: var(--color-text-light);
  font-size: 1.5rem;
  font-weight: bold;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.back-button:hover {
  background: rgba(255, 255, 255, 0.1);
}

.back-button.hidden {
  display: none !important;
}

/* Main Content */
.main-content {
  flex: 1;
  overflow: hidden;
  background: var(--color-background);
  position: relative;
  display: flex;
  flex-direction: column;
}

/* Screen Management */
.screen {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition-normal);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--spacing-md);
  padding-bottom: 80px; /* Space for bottom nav */
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
}

.screen.active {
  opacity: 1;
  transform: translateX(0);
  position: relative;
}

.screen-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  gap: var(--spacing-md);
}

.screen-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: var(--border-width) solid #ddd;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: inherit;
  background: var(--color-background);
  color: var(--color-text-primary);
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(255, 107, 53, 0.2);
}

.form-help {
  display: block;
  margin-top: var(--spacing-xs);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

/* Loading States */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-content {
  background: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xxl) var(--spacing-md);
  color: var(--color-text-secondary);
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }

/* Responsive Design */
@media (min-width: 576px) {
  .main-content {
    padding: var(--spacing-lg);
  }

  .app-title {
    font-size: 1.5rem;
  }
}

@media (min-width: 768px) {
  .app-container {
    max-width: 768px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
  }

  .main-content {
    padding: var(--spacing-xl);
  }
}

@media (min-width: 992px) {
  .app-container {
    max-width: 480px;
  }
}

/* Authentication states */
.app-container.unauthenticated .bottom-nav,
.app-container.unauthenticated .app-header {
  display: none !important;
}

.app-container.unauthenticated .screen:not(#login-screen) {
  display: none !important;
}

.app-container.unauthenticated #login-screen {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  transform: none !important;
  opacity: 1 !important;
  z-index: 9999 !important;
  padding: var(--spacing-md) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  background: var(--color-background) !important;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-color-scheme: dark) {
  /* Dark mode support could be added here */
}